Question

The muzzle velocity of a certain rifle is $330m{s}^{-1}$. At the end of one second, a bullet fired straight up into the air will travel a distance of

• A. $(330-4.9)m$
• B. $330m$
• C. $(330+4.9)m$
• D. $(330-9.8)m$

Answer 1

The correct option is A $(330-4.9)m$

Given:

The initial velocity $u=330m/s$

Time taken $t=1sec$

Acceleration = $-g$ (As the bullet is going up)

Using the equation of motion $s=ut-\frac{1}{2}g{t}^2$

$\therefore s=330\left(1\right)-\frac{1}{2}9.8{\left(1\right)}^2=(330-4.9)m$